.lt_main{
  position: relative;
}
.lt_nav{
  padding: 10px;
  li{
    float: left;
    width: 33.33%;
    a{
      display: block;
      width: 100%;
      height: 100%;
      img{
        display: block;
        width: 100%;
        height: 100%;
      }
    }
  }
}
